阅读理解。 Air Air has no smell. Air has no taste, But when the wind blows, You feel it on your face. Look at a kite, Or a plane in the air. How do they stay there? They ride on air. How does a balloon Rise in the air, And lift people up? It uses hot air. We need air to breathe, We need air to survive (生存). And when we breathe it, It keeps us alive. 1. Do you think that we can see air? A.Yes, it's very nice. B. No, but we can breathe it. C. Yes, it has taste. D. No, but we can smell it. 2. What does the underlined word 'They' refer to ( 指的是)? A. Wind and air. B. Smell and taste. C. A kite and a plane. D. Wind and clouds. 3. A balloon can lift people up with _________. A. hot air B. soft wind C. smell D. taste 4. What does the poem mainly (主要地) try to tell us? A. We need air sometimes. B. It's hard to stay in the air. C. Air is too little to waste. D. Air is very important to us.